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Author Topic: Stale diesel & MOT emission failure?  (Read 368 times)

Offline Peter Burgess

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Stale diesel & MOT emission failure?
« on: February 10, 2021, 09:29:49 AM »
Hi, my 2003 1.9 TDI has only covered 1300 miles in the last year & last fuelled up 4 months ago. It failed the MOT yesterday on emmissins, but not badly. I will change the air filter today (15000 miles). Would the old fuel be a factor? I've topped up with 27 litres up super diesel & will take it for a 70mph drive today. Is there anything else I should be doing? Thanks, Peter.

Offline SirDavidAlhambra

  • Sir David Alhambra.
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  • Region: South East
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Re: Stale diesel & MOT emission failure?
« Reply #1 on: February 10, 2021, 12:18:17 PM »
Not sure. Maybe just give it a bit of a thrashing to clear any gunk out. Make sure it's nicely warmed up before it gets taken in for the test.

I wonder if you could put in wome of that Wynns emission test additive too? I think they do a guarantee where they refund the money if the car doesn't pass?
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline johnnyroper

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Re: Stale diesel & MOT emission failure?
« Reply #2 on: February 10, 2021, 03:39:50 PM »
Hi, my 2003 1.9 TDI has only covered 1300 miles in the last year & last fuelled up 4 months ago. It failed the MOT yesterday on emmissins, but not badly. I will change the air filter today (15000 miles). Would the old fuel be a factor? I've topped up with 27 litres up super diesel & will take it for a 70mph drive today. Is there anything else I should be doing? Thanks, Peter.

Disconnect the MAF for the test and reconnect when it’s passed emissions. You won’t get any fault lights on a vw PD engine

Offline SirDavidAlhambra

  • Sir David Alhambra.
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Re: Stale diesel & MOT emission failure?
« Reply #3 on: February 10, 2021, 04:34:30 PM »
LOL... you guys!!  ;)

 woohoo
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline Peter Burgess

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Re: Stale diesel & MOT emission failure?
« Reply #4 on: February 10, 2021, 06:07:52 PM »
The air filter was quite dis coloured underneath, with the corrugated paper above looking clean. Whether it was restricting air flow, I don't know, but maybe enough to get the car through now.
Also, it is perishing cold at the moment & the MOT centre is only 2 miles away, so I think that the car may not have been fully warmed up. I'll take it for a 12 mile blat on the M11 before the re test on Friday.
I don't have time to use additive this year, but I will run a tank with it the month before MOT in future!
I'm not sure what difference disconnecting the MAF would make to the emmissions coming out of the zorst?
Thanks for all your help & advice.
Regards,
Peter.

Offline johnnyroper

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Re: Stale diesel & MOT emission failure?
« Reply #5 on: February 10, 2021, 07:16:28 PM »
It’s probably a combination of lack of use and not fully up to temp, disconnecting the MAF makes the ECU run at a a pre programmed figure for incoming air essentially. It will get the emissions down to pass levels.

Offline Stevie t

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Re: Stale diesel & MOT emission failure?
« Reply #6 on: March 31, 2021, 07:15:18 PM »
How did you go on pal ?

 

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